Calling Southwest to ask about when they will update their dates is usually a futile exercise. The reservation people always claim they are never told when the updates are coming.
I am never sure if this is the truth. Since I've had agents tell me they don't know and then found the dates change within the hour I called (how can you not know they are coming out that day?).
Your best bet is to keep checking their website every couple of days and keep checking this board, since the info seems to get posted here.
Unless your getting an amazing rate from another airline, I would wait to see Southwest, since they just dropped the rates on some of the October flights they posted last month. I booked MHT-MCO at $175.00 rt and now its $160.00.